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概要

In recent years, it has been reported that the primary water stress corrosion cracking (PWSCC) has occurred in dissimilar metal weld (DMW) components such as steam generator nozzle to safe end weld, reactor vessel nozzle to safe end weld, and so on, in PWR. The depth sizing of such cracks with high accuracy is important in order to ensure the reliable operation and life extension of nuclear power plants. Therefore, construction of the performance demonstration (PD) system for certifying DMW inspection method is being investigated, in Japan. In order to establish the DMW PD system, it is necessary to prepare the DMW specimens with SCC crack. However, it is difficult to fabricate the DMW specimen with deep SCC crack in 60%t (t: thickness). Then, the usefulness of DMW specimen with non-SCC crack was investigated. It was examined the signal to noise ratio of crack tip echoes in DMW specimens with SCC and non-SCC crack by phased array UT. From the experimental results, the equivalency of ultrasonic response relation between SCC and non-SCC crack was shown.

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